[Koha] ISBN - must they be unique?

[Anthony Mao]

Put at this subfiled if you use MARC21.
Refer to this page http://www.loc.gov/marc/bibliographic/bd020.html

020 - International Standard Book Number (R)
$z - Canceled/invalid ISBN
Canceled or invalid ISBN and any parenthetical qualifying information.
ISBN (invalid) and the embedded hyphens may be generated for display.
Each canceled/invalid ISBN is contained in a separate subfield $z. If
no valid ISBN exists, subfield $z may be used alone in the record.

020     ##$z0835200028 :$c$10.00
020     ##$a0835200019 (pbk.) :$c$2.95
[Two ISBN's associated with one catalog record, one of which is invalid.]

2012/10/4 e-Libris Helpdesk <elibris.helpdesk at gmail.com>:
> If all at possible you should not have records with duplicate ISBNs in your
> database. If you happen to upload a record containing an ISBN that is found
> in two existing records, Koha will create a third record. It does not
> matter if you set up your import profile to match on the ISBN, Koha cannot
> decide which of the two existing records to use.
>
>
> On Wed, Oct 3, 2012 at 1:47 PM, Elaine Bradtke <eb at efdss.org> wrote:
>
>> In the process of cleaning up data to prepare for a batch upload into
>> Koha, I have noticed that some of our ISBNs are not unique.  These are
>> books from small independent publishers who forgot to change the ISBN
>> when they issued a new book.   I'm happy to leave them in the ISBN
>> field (020a ) as long as this won't cause problems in Koha.   Looking
>> at the framework it is also tagged as  biblioitems.isbn.  I know
>> record matching uses ISBN. Does anyone know if the contents of this
>> field must be unique?
>> Thanks
>> --
>> Elaine Bradtke
>> Data Wrangler
>> VWML
>> English Folk Dance and Song Society | http://www.efdss.org
>> Cecil Sharp House, 2 Regent's Park Road, London NW1 7AY
>> Tel    +44 (0) 20 7485 2206 (This number is for the English Folk Dance
>> and Song Society in London, England. If you wish to phone me
>> personally, send an e-mail first. I work off site)
>> --------------------------------------------------------------------------
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>> ---------------------------------------------------------------------------
>> "Writing about music is like dancing about architecture"
>> --Elvis Costello (Musician magazine No. 60 (October 1983), p. 52)
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>
>
>
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